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?? 9??? ???? ??? ??? ??? ??.
?? ???? ???? ??? ??? ??? ??? ????: ??, ???, ????, ??.
Association Francaise de Normalisation, ???? ??
Japanese Industrial Standards Committee (JISC), ???? ??
FI-SFS, ???? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ???? ??
Korean Agency for Technology and Standards (KATS), ???? ??
Danish Standards Foundation, ???? ??
SCC, ???? ??
- NS 4745:1991 Water analysis - Determination of the sum of nitrite nitrogen and nitrate nitrogen